The candidates were expected to connect the circuit as shown, measure and
record the ammeter reading(mA) in Table 1 plot a graph of voltage against
current, determine the slope,L2 and make some evaluation.

The expected answers were:
(c) Table 2

Voltmeter reading (V)

Ammeter reading (mA)

3.0

60 (57-63)

4.0

70 (67-74)

6.0

110 (105-116)

8.0

150 (143-158)

9.0

170 (162-179)

12.0

220 (209-232)

(j) Evaluation of percentage difference between the slopes – No differences in values.
As reported by the Chief Examiner, the readings obtained by many of the candidates that answered this question showed that they did not know that the experiment bothered on Ohm’s law theory, hence their poor performance in it.